"I wanted to get Jordan Pacheco in the lineup," Gibson said. "I thought the best spot to put him at would be first base, move Mark out there in left field."
Trumbo began the season in left field, but moved to first base after Paul Goldschmidt was lost for the season due to a fractured left hand. Prior to this year, the majority of Trumbo's playing time had come at first base.
Bench coach Alan Trammell talked with Trumbo a little about some adjustments with his positioning and footwork that might help.
"He's a tall guy," Gibson said. "Maybe he's standing up a little more than normal. The other thing is, his glove, his target, is high. Maybe we'll move it down a little bit, spot it down. Any place you're at on defense, you can get a bad hop or get a low throw or high throw. You try to put yourself in the best position you can to be able to react and catch it."
Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.